Column adsorption and regeneration study of magnetic biopolymer resin for perchlorate removal in presence of nitrate and phosphate
Date
2019
Authors
Pan, J.
Gao, B.
Song, W.
Xu, X.
Jin, B.
Yue, Q.
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Journal of Cleaner Production, 2019; 213:762-775
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Jingwen Pan, Baoyu Gao, Wen Song, Xing Xu, Bo Jin, Qinyan Yue
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Abstract
A magnetized and quaternary amine-functionalized bio-resin derived from corn stalk (CS-MNB) was successfully synthesized and applied for perchlorate removal by combining of column adsorption and biological/chemical regeneration in presence of nitrate and phosphate. Characterization by SEM, TEM, XRD, Zeta potential, BET and XPS revealed that CS-MNB had well-developed pore structure, large surface area and lots of quaternary-amine groups, enhancing the diffusion and removal of anion. Column adsorption of co-anions was investigated considering the bed depths, flow rates, influent pHs and anion concentrations using CS-MNB. The performance of fixed-bed column was optimal at the condition of bed depth of 2.15 cm, flow rate of 5 mL/min, and pH 4. The maximum adsorption capacities of CS-MNB were calculated to be 23.16, 6.48 and 48.73 mg/g for perchlorate, nitrate and phosphate, respectively. These three anions could be efficiently removed by the magnetic bio-resin, through an ion-exchange reaction between Cl− in quaternary amine groups and the dissolved anions. After being adsorbed by the bio-resin, the concentrated anions could be efficiently bio-reduced by the acclimated sludge predominated by Proteobacteria species. The simultaneous perchlorate and nitrate reductions were achieved by biological regeneration, although a lower bio-regeneration efficiency (26–89%) was observed as compared with that of chemical regeneration (90–93%).
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